Forecasters say polar air from the Arctic Ocean is expected to arrive in Canada and the United States next week, bringing unseasonably cool temperatures to the eastern half of the country. Temperatures in Chicago will top out in the low 70s by midweek, making it seem like mid-September rather than mid-July. Compare Wednesday's forecasted high — 72 degrees — with the temperature on July 16, 2013: 93 degrees.

Similarly comfortable temperatures are expected as far south as Texas, part of what the National Oceanic and Atmospheric Association calls a "backward trajectory" of air.

According to the National Weather Service, temperatures could fall to about 20 degrees below normal in Kansas and Oklahoma.

07-10-2014, 08:10 PM

RobJohnson

95 in rural Nevada, I almost need a jacket.

If my allergies were not acting up I would be kicking up some dust with my ATV out in the desert. I still might.

Measurements made by Swarm over the past six months confirm the general trend of the field’s weakening with the most dramatic declines over the Western Hemisphere. But in other areas, such as the southern Indian Ocean, the magnetic field has strengthened since January. The field is particularly weak over the South Atlantic Ocean known as the South Atlantic Anomaly and the latest measurements confirm the movement of magnetic North towards Siberia.

The weak field has indirectly caused many temporary satellite ‘hiccups’ (called Single Event Upsets) as the satellites are exposed to strong radiation over this area.